Symptom Chart

Condition	Possible Sources	Action
No communication with the instrument cluster (IC)	Fuse(s) Wiring, terminals or connectors IC	REFER to MODULE COMMUNICATIONS NETWORK article.
No communication with the smart junction box (SJB)	Fuse(s) Wiring, terminals or connectors SJB	REFER to MODULE COMMUNICATIONS NETWORK article.
All network controlled illumination does not dim	MS-CAN network SJB	CARRY OUT the network test. If the scan tool responds with no communication to any module on the MS-CAN network, REFER to MODULE COMMUNICATIONS NETWORK article. If the scan tool communicates with the modules on the MS-CAN network, INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES article. TEST the system for normal operation.
The instrument cluster (IC) illumination is inoperative	IC	CHECK for communication with the IC. If there is no communication with the IC, REFER to MODULE COMMUNICATIONS NETWORK article. If the scan tool communicates with the IC, INSTALL a new IC. REFER to INSTRUMENT CLUSTER (IC), MESSAGE CENTER, AND WARNING CHIMES article. TEST the system for normal operation.
The audio control module (ACM) illumination is inoperative	ACM	CHECK for communication with the ACM. If there is no communication with the ACM, REFER to MODULE COMMUNICATIONS NETWORK article. If the scan tool communicates with the ACM, INSTALL a new ACM. REFER to INFORMATION AND ENTERTAINMENT SYSTEMS article. TEST the system for normal operation.
The control illumination is inoperative - all hardwired illumination	Fuse Instrument panel dimmer switch SJB	Go to Pinpoint Test A .
The auxiliary climate control illumination is inoperative (if equipped)	Wiring, terminals or connectors Auxiliary climate control	Go to Pinpoint Test B .
The window control switch illumination is inoperative	Window control switch	CHECK the operation of the power windows. If the power windows operate correctly, INSTALL a new window control switch. REFER to GLASS, FRAMES AND MECHANISMS article. TEST the system for normal operation. If the power windows do not operate correctly, REFER to GLASS, FRAMES AND MECHANISMS article.
The steering wheel control illumination is inoperative	Wiring, terminals or connectors Steering wheel control switch(es) Steering wheel control switch harness Clockspring	Go to Pinpoint Test C .
One or more module-controlled illumination source(s) is inoperative - all hardwired illumination	Wiring, terminals or connectors Four-wheel drive switch Memory set switch (if equipped) Heating ventilation air conditioning (HVAC) module (if equipped) Heated seat/windshield switch (if equipped) Manual climate control switch (if equipped) Adjustable pedal switch (if equipped) Traction control switch (if equipped) Headlamp switch Shifter assembly LH door lock control switch RH door lock control switch Roof opening panel switch (Sport Trac only) Rear window adjust switch (Sport Trac only) SJB	Go to Pinpoint Test D .
The control illumination is always on - all hardwired illumination	Wiring, terminals or connectors SJB	Go to Pinpoint Test E .
The control illumination does not dim	Wiring, terminals or connectors Instrument panel dimmer switch SJB	Go to Pinpoint Test F .